methyl 2,3,6-tri-O-benzyl-β-D-glucopyranoside   、                                                                                      
3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-β-D-galactopyranosyl bromide                                                                                                                                                              在
                                                                                                                                                                                 
2,4,6-三甲基吡啶   、                                                                                                  3 A molecular sieve   、                                                                                                  
silver trifluoromethanesulfonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
硝基甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以39%的产率得到methyl 2,3,6-tri-O-benzyl-4-O-(3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-β-D-galactopyranosyl)-β-D-glucopyranoside